摘要
进入水驱后期开采的油田剩余油高度分散,平面上分流线和主流线的剩余油饱和度差别明显。常规的脉冲注水(周期注水)最佳参数难以把握,周期停注比过大引起地层能量过分下降,反而导致降水降液不增油,达不到预期的效果。基于这一认识,提出线状注水开展隔井脉冲注水提高采收率的新方法,即在隔井停注期间,邻井提水,确保稳定地层能量的基础上,调整流线分布以达到提高采收率的目的。并主要运用渗流力学理论对该方法可行性进行了分析论证。该方法在孤岛油田南区渤19块试验2年来已取得了较好的降水增油效果,阶段含水比试验前下降1.3%,累计增油1.9×104t,水驱采收率提高5.8%,展示了良好的应用前景。
The distribution of remaining oil is highly dispersive at the late stage of water injection, and obvious differences of remaining oil saturation between the individual streamline and the main exist. The high ratio of stop-injection to water injection may cause the great decrease of formation energy, leading to the decreasing of water cut and fluid, but no increasing of oil production, so the predicated objects can not be achieved. Based on the above conditions, a new method of pulse water injection in interval well to increase the reservoir recovery is presented. During shutting down in the interval wells, the adjoining well's water volume is enhanced to ensure the formation energy for stabilizing; the reservoir recovery is increased by adjustment of streamline distribution. After the trial to the Block No. 19, in the south of Gudao Oilfield for two years, the ratio of water-bearing is 1.3% lower than that of before the progress and the accumulated oil production is 1.9×10^(4)t, and the water injection recovery is increased up to 5.8%.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期95-97,共3页
Petroleum Exploration and Development
关键词
线状注水井网
隔井脉冲注水
采收率
interval wells
pulse water-injection of line pattern
recovery
